15 Works

Data from: Quick divergence but slow convergence during ecotype formation in lake and stream stickleback pairs of variable age

Kay Lucek, Arjun Sivasundar, Bjarni K. Kristjánsson, Skúli Skúlason & Ole Seehausen
When genetic constraints restrict phenotypic evolution, diversification can be predicted to evolve along so-called lines of least resistance. To address the importance of such constraints and their resolution, studies of parallel phenotypic divergence that differ in their age are valuable. Here, we investigate the parapatric evolution of six lake and stream threespine stickleback systems from Iceland and Switzerland, ranging in age from a few decades to several millennia. Using phenotypic data, we test for parallelism...

Data from: Group-size dependent punishment of idle subordinates in a cooperative breeder where helpers pay to stay

Stefan Fischer, Markus Zöttl, Frank Groenewoud, Barbara Taborsky & M. Zottl
In cooperative breeding systems, dominant breeders sometimes tolerate unrelated individuals even if they inflict costs on the dominants. According to the ‘pay-to-stay’ hypothesis, (i) subordinates can outweigh these costs by providing help and (ii) dominants should be able to enforce help by punishing subordinates that provide insufficient help. This requires that dominants can monitor helping and can recognize group members individually. In a field experiment, we tested whether cooperatively breeding cichlid Neolamprologus pulcher subordinates increase...

Data from: The evolution of scarab beetles tracks the consecutive rise of angiosperms and mammals

Dirk Ahrens, Julia Schwarzer & Alfried P. Vogler
Extant terrestrial biodiversity arguably is driven by the evolutionary success of angiosperm plants, but the evolutionary mechanisms and timescales of angiosperm-dependent radiations remain poorly understood. The Scarabaeoidea is a diverse lineage of predominantly plant- and dung-feeding beetles. Here, we present a phylogenetic analysis of Scarabaeoidea based on four DNA markers for a taxonomically comprehensive set of specimens and link it to recently described fossil evidence. The phylogeny strongly supports multiple origins of coprophagy, phytophagy and...

Data from: Disentangling the role of phenotypic plasticity and genetic divergence in contemporary ecotype formation during a biological invasion

Kay Lucek, Arjun Sivasundar & Ole Seehausen
The occurrence of contemporary ecotype formation through adaptive divergence of populations within the range of an invasive species typically requires standing genetic variation but can be facilitated by phenotypic plasticity. The relative contributions of both of these to adaptive trait differentiation have rarely been simultaneously quantified in recently diverging vertebrate populations. Here we study a case of intraspecific divergence into distinct lake and stream ecotypes of threespine stickleback that evolved in the past 140 years...

Data from: Climate-mediated movement of an avian hybrid zone

Scott A. Taylor, Thomas A. White, Wesley M. Hochachka, Valentina Ferretti, Robert L. Curry & Irby Lovette
The interaction between sibling species that share a zone of contact is a multifaceted relationship affected by climate change. Between sibling species, interactions may occur at whole-organism (direct or indirect competition) or genomic (hybridization and introgression) levels. Tracking hybrid zone movements can provide insights about influences of environmental change on species interactions. Here, we explore the extent and mechanism of movement of the contact zone between black-capped chickadees (Poecile atricapillus) and Carolina chickadees (Poecile carolinensis)...

Data from: Seedling resistance, tolerance and escape from herbivores: insights from co-dominant canopy tree species in a resource-poor African rain forest

Julian M. Norghauer, Gaёtan Glauser & David M. Newbery
Although plants can reduce the impacts of herbivory in multiple ways, these defensive traits are often studied in isolation and an understanding of the resulting strategies is incomplete. In the study reported here, empirical evidence was simultaneously evaluated for the three main sets of traits available to plants: (1) resistance through constitutive leaf traits, (2) tolerance to defoliation, and (3) escape in space, for three caesalpiniaceous tree species Microberlinia bisulcata, Tetraberlinia bifoliolata and T. korupensis,...

Data from: Contemporary ecotypic divergence during a recent range expansion was facilitated by adaptive introgression

Kay Lucek, Mélissa Lemoine & Ole Seehausen
Although rapid phenotypic evolution during range expansion associated with colonization of contrasting habitats has been documented in several taxa, the evolutionary mechanisms that underlie such phenotypic divergence have less often been investigated. A strong candidate for rapid ecotype formation within an invaded range is the three-spine stickleback in the Lake Geneva region of central Europe. Since its introduction only about 140 years ago, it has undergone a significant expansion of its range and its niche,...

Data from: Validation of network communicability metrics for the analysis of brain structural networks.

Jennifer Andreotti, Kay Jann, Lester Melie-Garcia, Stéphanie Giezendanner, Eugenio Abela, Roland Wiest, Thomas Dierks & Andrea Federspiel
Computational network analysis provides new methods to analyze the brain's structural organization based on diffusion imaging tractography data. Networks are characterized by global and local metrics that have recently given promising insights into diagnosis and the further understanding of psychiatric and neurologic disorders. Most of these metrics are based on the idea that information in a network flows along the shortest paths. In contrast to this notion, communicability is a broader measure of connectivity which...

Data from: Fast adaptive responses in the oral jaw of Lake Victoria cichlids

Jacco C. Van Rijssel, Ellen S. Hoogwater, Mary A. Kishe-Machumu, Elize Van Reenen, Kevin V. Spits, Ronald C. Van Der Stelt, Jan H. Wanink & Frans Witte
Rapid morphological changes in response to fluctuating natural environments are a common phenomenon in species that undergo adaptive radiation. The dramatic ecological changes in Lake Victoria provide a unique opportunity to study environmental effects on cichlid morphology. This study shows how four haplochromine cichlids adapted their premaxilla to a changed diet over the past 30 years. Directly after the diet change toward larger and faster prey in the late 1980s, the premaxilla (upper jaw) changed...

Data from: Resource-mediated indirect effects of grassland management on arthropod diversity

Nadja K. Simons, Martin M. Gossner, Thomas M. Lewinsohn, Steffen Boch, Markus Lange, Jörg Müller, Esther Pašalić, Stephanie A. Socher, Manfred Türke, Markus Fischer & Wolfgang W. Weisser
Intensive land use is a driving force for biodiversity decline in many ecosystems. In semi-natural grasslands, land-use activities such as mowing, grazing and fertilization affect the diversity of plants and arthropods, but the combined effects of different drivers and the chain of effects are largely unknown. In this study we used structural equation modelling to analyse how the arthropod communities in managed grasslands respond to land use and whether these responses are mediated through changes...

Data from: Hide and seek in vegetation: time-to-detection is an efficient design for estimating detectability and occurrence

Christophe N. Bornand, Marc Kéry, Lena Bueche & Markus Fischer
1. Ecology and conservation require reliable data on the occurrence of animals and plants. A major source of bias is imperfect detection, which, however, can be corrected for by estimation of detectability. In traditional occupancy models, this requires repeat or multi-observer surveys. Recently, time-to-detection models have been developed as a cost-effective alternative, which requires no repeat surveys and hence costs could be halved. 2. We compared the efficiency and reliability of time-to-detection and traditional occupancy...

Data from: 'Prudent habitat choice': a novel mechanism of size-assortative mating

Barbara Taborsky, Luzia Guyer & Patrick Demus
Assortative mating, an ubiquitous form of nonrandom mating, strongly impacts Darwinian fitness and can drive biological diversification. Despite its ecological and evolutionary importance, the behavioural processes underlying assortative mating are often unknown, and in particular, mechanisms not involving mate choice have been largely ignored so far. Here, we propose that assortative mating can arise from ‘prudent habitat choice’, a general mechanism that acts under natural selection, and that it can occur despite a complete mixing...

Data from: Behavioural isolation may facilitate homoploid hybrid speciation in cichlid fish

Oliver M. Selz, Rahel Thommen, Martine E. Maan & Ole Seehausen
Hybrid speciation is constrained by the homogenizing effects of gene flow from the parental species. In the absence of post-mating isolation due to structural changes in the genome, or temporal or spatial premating isolation, another form of reproductive isolation would be needed for homoploid hybrid speciation to occur. Here, we investigate the potential of behavioural mate choice to generate assortative mating among hybrids and parental species. We made three-first-generation hybrid crosses between different species of...

Data from: Differential responses of herbivores and herbivory to management in temperate European beech

Martin M. Gossner, Esther Pašalić, Markus Lange, Patricia Lange, Dominik Hessenmöller, Jörg Müller, Stephanie A. Socher, Markus Fischer, Ernst-Detlef Schulze, Wolfgang W. Weisser & Steffen Boch
Forest management not only affects biodiversity but also might alter ecosystem processes mediated by the organisms, i.e. herbivory the removal of plant biomass by plant-eating insects and other arthropod groups. Aiming at revealing general relationships between forest management and herbivory we investigated aboveground arthropod herbivory in 105 plots dominated by European beech in three different regions in Germany in the sun-exposed canopy of mature beech trees and on beech saplings in the understorey. We separately...

Data from: A genomic perspective on a new bacterial genus and species from the Alcaligenaceae family, Basilea psittacipulmonis

Katrine L. Whiteson, David Hernandez, Vladimir Lazarevic, Nadia Gaia, Laurent Farinelli, Patrice François, Paola Pilo, Joachim Frey & Jacques Schrenzel
Background: A novel Gram-negative, non-haemolytic, non-motile, rod-shaped bacterium was discovered in the lungs of a dead parakeet (Melopsittacus undulatus) that was kept in captivity in a petshop in Basel, Switzerland. The organism is described with a chemotaxonomic profile and the nearly complete genome sequence obtained through the assembly of short sequence reads. Results: Genome sequence analysis and characterization of respiratory quinones, fatty acids, polar lipids, and biochemical phenotype is presented here. Comparison of gene sequences...

Registration Year

  • 2014
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Resource Types

  • Dataset
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Affiliations

  • University of Bern
    15
  • University of Zurich
    2
  • Technical University Munich
    2
  • University of Potsdam
    2
  • Max Planck Institute for Biogeochemistry
    2
  • Hólar University College
    1
  • Tanzania Fisheries Research Institute
    1
  • Swiss Federal Institute of Aquatic Science and Technology
    1
  • University of Neuchâtel
    1
  • University of Groningen
    1